I have to go with the real team here and vote for The Hart Foundation.
For one, you just can't vote for a team who was randomly thrown together, against one of the greatest tag teams in professional wrestling history, especially when one competitor from said tag team turned out to be perhaps the greatest ever to lace up a pair of boots and step through that curtain (Bret Hart, of course).
And looking at it kayfabe, I still don't see how Bigelow and Bossman could ever defeat the Hart Foundation, either. I mean, Bret Hart has ALWAYS had Bam Bam Bigelow's number, and throughout most his career Bossman was nothing more than a jobber. Hart alone could defeat these two guys in the same night in singles matches, so you give him a tag partner as big, explosive, and wild as the Anvil, who he also has TREMENDOUS chemistry with, there's no way Bigelow and Bossman could ever stand a chance